Circulating lubrication system in a paper or board machine, which has at least one lubrication point in a lubrication circuit (14, 17) which has a measuring device for measuring a selected variable and a control device (20) and a control device (15) coupled thereto for controlling the lubricant flow a selected measured variable, the measuring device consisting of a temperature sensor (22, 23) measuring the temperature of the lubricating point (10) or the lubricating oil flowing out of it, and the regulating device (20) being set up to regulate said temperature, the paper or Board machine has a machine control system and a data bus (RS485), which connects the machine control system and the lubrication point control device (15) and the measuring sensors (22, 23) to one another, the control device (20) forming part of the machine control device and being connected to the control device (15 ) and the measuring sensors (22, 23) with Hi If an I/O card arranged at the lubrication point is connected, which transmits the data from the measuring sensors (22, 23) to the control device and the control command coming from the control device (20) to the control device (15), the lubrication point being within of the hood, wherein inside the hood (12) there is a refrigerated space (25) in which at least the I/O card (20') or the control device (20) is arranged, and wherein in the space (25) a lubricating oil circulation for cooling this space (25) is arranged. (3+4+6+8)
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